Fibrinogen, also referred to as factor I, is a 340-kilodalton glycoprotein that is produced by the liver.6 Fibrinogen has a plasma half-life of about four days. Proteolytic conversion of fibrinogen to fibrin occurs through both the extrinsic and intrinsic pathways.6 Severe fibrinogen deficiency should be considered when a patient with bleeding history has both extended protime (PT) and activated partial thromboplastin time (aPTT).7,8 Mild deficiency may not produce prolongation of either the aPTT or PT and, therefore, fibrinogen activity should be measured in individuals with a bleeding tendency even when the aPTT and PT are in the normal reference interval.

Fibrinogen Activity

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    -Ecclesiastes 9:16-17

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